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<span class="token keyword">let</span> rg<span class="token operator">=</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">123</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token number">123</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//true</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">&quot;abc&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//false</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><ul><li>match() 方法可在字符串内检索指定的值，或找到一个或多个正则表达式的匹配。</li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token comment">//贪婪匹配</span>
<span class="token keyword">let</span> rg<span class="token operator">=</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\d{2,5}</span><span class="token regex-delimiter">/</span><span class="token regex-flags">g</span></span><span class="token punctuation">;</span>
<span class="token keyword">let</span> str<span class="token operator">=</span><span class="token string">&quot;123 1234 12345 123456&quot;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>str<span class="token punctuation">.</span><span class="token function">match</span><span class="token punctuation">(</span>rg<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">//正则 /\d{2,5}/，表示数字连续出现 2 到 5 次。会匹配 2 位、3 位、4 位、5 位连续数字,其是贪婪的，它会尽可能多的匹配</span>
<span class="token comment">//惰性匹配</span>
<span class="token keyword">var</span> regex <span class="token operator">=</span> <span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">\d{2,5}?</span><span class="token regex-delimiter">/</span><span class="token regex-flags">g</span></span><span class="token punctuation">;</span>
<span class="token keyword">var</span> string <span class="token operator">=</span> <span class="token string">&quot;123 1234 12345 123456&quot;</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span> string<span class="token punctuation">.</span><span class="token function">match</span><span class="token punctuation">(</span>regex<span class="token punctuation">)</span> <span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//[&quot;12&quot;, &quot;12&quot;, &quot;34&quot;, &quot;12&quot;, &quot;34&quot;, &quot;12&quot;, &quot;34&quot;, &quot;56&quot;]</span>
<span class="token comment">//其中 /\d{2,5}?/ 表示，虽然 2 到 5 次都行，当 2 个就够的时候，就不再往下尝试了。</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><ul><li>replace() 方法用于在字符串中用一些字符替换另一些字符，或替换一个与正则表达式匹配的子串。</li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code>stringObject<span class="token punctuation">.</span><span class="token function">replace</span><span class="token punctuation">(</span>regexp<span class="token operator">/</span>substr<span class="token punctuation">,</span>replacement<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> str1<span class="token operator">=</span><span class="token string">&quot;Visit Microsoft!&quot;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>str1<span class="token punctuation">.</span><span class="token function">replace</span><span class="token punctuation">(</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">Microsoft</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">,</span> <span class="token string">&quot;W3School&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//Visit W3School!</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><h2 id="边界符"><a href="#边界符" class="header-anchor">#</a> 边界符^$</h2> <ul><li>/^123/表示必须以123<strong>开头</strong></li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">let</span> rg<span class="token operator">=</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">^123</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'123456'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//true</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'456123'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//false</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>/123$/表示必须以123<strong>结尾</strong></li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">let</span> rg<span class="token operator">=</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">123$</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'123456'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//false</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'456123'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//true</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li>^和$一起使用代表精确匹配</li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">let</span> rg<span class="token operator">=</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">^123$</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'123456'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//false</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'456123'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//false</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'123'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//true</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h2 id="常用字符"><a href="#常用字符" class="header-anchor">#</a> 常用字符[]-^</h2> <ul><li><strong>[]:表示有一系列字符可以选择，只要匹配其中的一个就可以</strong>I</li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">let</span> rg<span class="token operator">=</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">[123]</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'123456'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//true</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'456123'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//true</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'1'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//true</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><ul><li><strong>-:选择范围[1-9]表示1-9其中一个数字都符合，常见的还有[a-z]小写字母都匹配,[a-zA-Z]大小写都匹配,[a-zA-Z0-9_-]大小写和-_都匹配</strong></li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">let</span> rg<span class="token operator">=</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">[1-9]</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'asdf'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//false</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'456123'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//false</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'1'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//true</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><ul><li><strong>如果中括号内[]有^字符，代表取反的意思，区别于中括号外的边界符</strong></li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">let</span> rg<span class="token operator">=</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">[^1-9]</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'asdf'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//true</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'456123'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//true</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'1'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//false</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h2 id="量词符-n-n-n-m"><a href="#量词符-n-n-n-m" class="header-anchor">#</a> 量词符*+？{n}{n,}{n,m}</h2> <ul><li><strong>*相当于&gt;=0，可以出现0次或者很多次</strong></li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">let</span> rg<span class="token operator">=</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">^a*</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'asdf'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token punctuation">;</span><span class="token comment">//true</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'4561a23'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token punctuation">;</span><span class="token comment">//true</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'1'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//true</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><ul><li><strong>+想当与&gt;=1，可以出现1次或者很多次</strong></li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">let</span> rg<span class="token operator">=</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">^a+</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'asdf'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//true</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'4561a23'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//false</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>rg<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'1'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//false</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><ul><li><p><strong>？相当于1||0</strong></p></li> <li><p><strong>{3}就是重复3次</strong></p></li> <li><p><strong>{3，}大于等于3</strong></p></li> <li><p><strong>{3，16}大于等于3且小于等于16</strong></p></li></ul> <h2 id="常见的简写形式"><a href="#常见的简写形式" class="header-anchor">#</a> 常见的简写形式</h2> <p><img src="https://gitee.com/ekzodia_lty/blog-image/raw/master/img/20220226223735.png" alt=""></p></div></section> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">Last Updated: </span> <span class="time">2/28/2022, 4:26:59 PM</span></div></footer> <!----> <div class="comments-wrapper"><!----></div> <ul class="side-bar sub-sidebar-wrapper" style="width:12rem;" data-v-cb1513f6><li class="level-2" data-v-cb1513f6><a href="/blog/blogs/JavaScript/regexp.html#正则表达式常用方法" class="sidebar-link reco-side-正则表达式常用方法" data-v-cb1513f6>正则表达式常用方法</a></li><li class="level-2" data-v-cb1513f6><a href="/blog/blogs/JavaScript/regexp.html#边界符" class="sidebar-link reco-side-边界符" data-v-cb1513f6>边界符^$</a></li><li class="level-2" data-v-cb1513f6><a href="/blog/blogs/JavaScript/regexp.html#常用字符" class="sidebar-link reco-side-常用字符" data-v-cb1513f6>常用字符[]-^</a></li><li class="level-2" data-v-cb1513f6><a href="/blog/blogs/JavaScript/regexp.html#量词符-n-n-n-m" class="sidebar-link reco-side-量词符-n-n-n-m" data-v-cb1513f6>量词符*+？{n}{n,}{n,m}</a></li><li class="level-2" data-v-cb1513f6><a href="/blog/blogs/JavaScript/regexp.html#常见的简写形式" class="sidebar-link reco-side-常见的简写形式" data-v-cb1513f6>常见的简写形式</a></li></ul></main> <!----></div></div></div></div><div class="global-ui"><div class="back-to-ceiling" style="right:1rem;bottom:6rem;width:2.5rem;height:2.5rem;border-radius:.25rem;line-height:2.5rem;display:none;" data-v-c6073ba8 data-v-c6073ba8><svg t="1574745035067" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="5404" class="icon" data-v-c6073ba8><path d="M526.60727968 10.90185116a27.675 27.675 0 0 0-29.21455937 0c-131.36607665 82.28402758-218.69155461 228.01873535-218.69155402 394.07834331a462.20625001 462.20625001 0 0 0 5.36959153 69.94390903c1.00431239 6.55289093-0.34802892 13.13561351-3.76865779 18.80351572-32.63518765 54.11355614-51.75690182 118.55860487-51.7569018 187.94566865a371.06718723 371.06718723 0 0 0 11.50484808 91.98906777c6.53300375 25.50556257 41.68394495 28.14064038 52.69160883 4.22606766 17.37162448-37.73630017 42.14135425-72.50938081 72.80769204-103.21549295 2.18761121 3.04276886 4.15646224 6.24463696 6.40373557 9.22774369a1871.4375 1871.4375 0 0 0 140.04691725 5.34970492 1866.36093723 1866.36093723 0 0 0 140.04691723-5.34970492c2.24727335-2.98310674 4.21612437-6.18497483 6.3937923-9.2178004 30.66633723 30.70611158 55.4360664 65.4791928 72.80769147 103.21549355 11.00766384 23.91457269 46.15860503 21.27949489 52.69160879-4.22606768a371.15156223 371.15156223 0 0 0 11.514792-91.99901164c0-69.36717486-19.13165746-133.82216804-51.75690182-187.92578088-3.42062944-5.66790279-4.76302748-12.26056868-3.76865837-18.80351632a462.20625001 462.20625001 0 0 0 5.36959269-69.943909c-0.00994388-166.08943902-87.32547796-311.81420293-218.6915546-394.09823051zM605.93803103 357.87693858a93.93749974 93.93749974 0 1 1-187.89594924 6.1e-7 93.93749974 93.93749974 0 0 1 187.89594924-6.1e-7z" p-id="5405" data-v-c6073ba8></path><path d="M429.50777625 765.63860547C429.50777625 803.39355007 466.44236686 1000.39046097 512.00932183 1000.39046097c45.56695499 0 82.4922232-197.00623328 82.5015456-234.7518555 0-37.75494459-36.9345906-68.35043303-82.4922232-68.34111062-45.57627738-0.00932239-82.52019037 30.59548842-82.51086798 68.34111062z" p-id="5406" data-v-c6073ba8></path></svg></div></div></div>
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